3100% is the change from 7 to 224
Calculation steps:
[( 224 - 7 ) ÷ 7] x 100 = 3100%
Formula
Percentage change = [(224 - 7) / 7] x 100
Subtract the new number by the original number
224 - 7 = 217
217 ÷ 7 = 31
31 x 100 = 3100%
Example